k8s-01:/opt/k8s/conf # cd /opt/k8s/conf/
k8s-01:/opt/k8s/conf # cat > docker.service <<-EOF[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still# exists and systemd currently does not support the cgroup feature set required# for containers run by docker
ExecStart=/usr/bin/dockerd \$DOCKER_NETWORK_OPTIONS
EnvironmentFile=-/run/flannel/docker
ExecReload=/bin/kill -s HUP \$MAINPID
TimeoutSec=0
RestartSec=2
Restart=always
# Note that StartLimit* options were moved from "Service" to "Unit" in systemd 229.# Both the old, and new location are accepted by systemd 229 and up, so using the old location# to make them work for either version of systemd.
StartLimitBurst=3
# Note that StartLimitInterval was renamed to StartLimitIntervalSec in systemd 230.# Both the old, and new name are accepted by systemd 230 and up, so using the old name to make# this option work for either version of systemd.
StartLimitInterval=60s
# Having non-zero Limit*s causes performance problems due to accounting overhead# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
# Comment TasksMax if your systemd version does not support it.# Only systemd 226 and above support this option.
TasksMax=infinity
# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes
# kill only the docker process, not all processes in the cgroup
KillMode=process
[Install]
WantedBy=multi-user.target
EOF